Compressor



June 11, 1935. E. KAGI COMPRESSOR Filed May 9, 1933 INVENTOR MAN)-ATTORNEYS Patented June 11, 1935 UNITED STATES PATENT OFFICE COMPRESSOREmil Kiigi, Winterburg, Switzerland, assignor to firm Sulzer Frres SocitAnonyme, Winter thur, Switzerland Application May 9, 1933, Serial No.670,001)" In Switzerland May 27, 1932 8 Claims.

ates by means of inertia.

The principal object of the present invention is to provide a simpledevice which operates with very little vibration and therefore does notcause objectionable noise.

Another object of this invention is to prevent the chattering and othervibrations during the starting or stopping of the machine.

Other objects, and the manner in which they are attained, willappearfrom the following 'description.

One embodiment of the invention is diagrammatically represented in thedrawing, in which Figure 1 is a longitudinal section through thecompressor, and 1 Figure 2 is a cross-sectional view of the compressor.

Briefly explained, a compressor or pump according to the presentinvention comprises three distinct structures. The stator (secondstructure) and the rotor (first structure) of an electromotor arearranged with their axes of rotation displaced relatively to each other,the rotor en circling the stator. The rotor is supported in aball-bearing secured to a bracket from which the apparatus is suspended,and is rotatable about its axis of symmetry. The stator is supported ina ball-bearing arranged on the rotor, but is prevented from rotatingabout its axis. When current is supplied to the eleotro-motor, the rotoris caused to rotate relatively to the bracket and the stator. Due to thedisplacement of the axes, the stator is moved bodily in a circular path,the radius of which is the distance of displacement between the twoaxes, its center being located on the axis of rotation of the rotor.

The third structure is contained in housing parts connected to thestator. A displacer or ec centric piston arranged in the interior of theworking chamber is swung around centrifugally therein by the motion ofthe stator in its circular path. Then the actual work, e. g., thecompression of the medium supplied to the working chamber, is performedby means of inertia or mass forces.

More specifically, the driving system I consists of the bell-shapedbearing-housing I, the motor casing 2 with the rotary part 3 of anelectric motor, and the bell-shaped casing part 4. The three housingparts I, 2 and 4 are held together by means of nuts and bolts 5 and l.The lumens,

inside bores or cylindrical inner surfaces, both of the motor housing 2and of the bell-shaped housing part 4 are excentrically arranged withrespect to their outer surfaces, which latter are in the form ofsurfaces of rotation, so that the center of gravity of these twohousings does not coincide with the axis of symmetry of their outersurfaces. Each of the housing parts I, 2 and 4 is suspended by means ofbolts 'I from the disc 8 with a ring 9 made of a resilient material(rubber, for instance) interposed between the lower boltheads and themember I. Mounted in the disc is a ball-bearing III, by means of whichthe entire machine is suspended from the bolt I3 connected to the fixedsupport I2 by means of yoke II.

The system II to which is imparted a translational motion, comprises thestator I5 of an electromotor shrunk on a shaft I4, housing parts I6,II-and I8 of the actuating mechanism, and a disc 20 which defines andcontains the working-chamber I9, and is mounted, by means of ballbearings 28 and 29, in the driving system I in such a manner that theaxis of symmetry A of the external boundaries of the driving system I,and the axis .of symmetry B of the system II, to which a translatorymotion is imparted, are spaced apart a distance a. Through the conduitIII the medium to be compressed is inducted, and through conduit 22 itis abducted- Conduit 23 serves as a lubricant-feed line. Each of theseconduits is made resilient, and connected at one end with the fixed baseI2 and at the other end with the system H.

The system III which directly performs the actual compressing, comprisesa displacer or eccentric piston, 2d, and fiyweights 25 and 26 rigidlyfixed. and connected to the displacer on either face thereof. The axisof symmetry C of the system III is ofiset by a distance D from the axisof symmetry of the system H. I

When electric energy is supplied to the electric motor (comprising thestator I5 and the rotor 3) through the leads (i l, the current flowsthrough the brushes t5, the slip rings 21, the leads, the leads M, andtherefrom partly through the brush 48 to the commutator 49, and partlyto the field coils 5d; the current returns partly from the commutator itthrough the brush 52, and partly from the field coils 50, through theleads 5|, the leads it, the slip rings 21 to the brushes 45. A rotarymoment is then set up between the driving system I and the system IIwhich moves along a circular path, which moment causes both systems totend to rotate, one relatively to the other.

Since the translatorily moving system II is prevented from rotating dueto the conduits 21, 22, 23, and the driving system'is mounted upon theball-bearing ID, the driving system I starts rotating. 'Since the axis Bof the two ball-bearings 28 and 29 is offset relatively to axis A adistance and parallel thereto, the system II executes, during therotation of the driving system I, a movement of translation over adistance a, constituting the diameter of the stroke. describes, with itsaxis B, a circle Q about the axis A of system I.

With an excentric arrangement of the components of' the driving systemI, the center of gravity of the compressor as a whole aligns itself withthe axis of symmetryA of the surface of the driving system 1, due to theexcentric arrangement of the two systems II and III, so that withundisturbed rotation it turns upon itself, for the reason that its axisof symmetry is at the same time the axis of rotation of ball bearing ID.The surface therefore has the semblance of a cylinder rotating onitself, which on coming into contact with some other object, gives riseto no danger of knocking and does not'cause the surrounding air tovibrate at audible frequency.

The .translatory'movement of system II centrifugally casts thework-performing system III around the inner periphery of the housingpart IS, in such a way that the two flyweights 25 and 26, formed assolids of revolution, roll upon the inner cylindrical surface of housingpart 18. During this motion the displacer body 24 describes, withitsaxis of symmetry C, a circle R with the axis of symmetry B of system IIas its center. The slide-plate 30 during this motion of the displacerbody 24, reciprocates, e; g. byspring action (not shown) which springmay be inserted within the slot in which the plate 30 m ves, with one ofits edges continuously contactin with the cylindrical surface of thedisplacer 24. The faces of the fiyweights 25 and 26 contacting disc 20,are

adjusted with a slight clearance from the surfaces of disc 20 anddefine, within chamber 19, a cres.-

centshaped work space for the compression.

The work space l9 becomes larger on one side of plate 30 and becomessmaller on the other side thereof during rotation in the direction ofarrow 31, in such a way that the working medium inducted by suction fromthe supply conduit 2! is compressed and is forced outwardly throughorifree 32 by way of valve 33 into space 34 whence it is finallyabducted through conduit 22. For lubricating the surfaces, subjected tofriction, between the flyweights 25 and 26 and disc 20, the lubricantfed through conduit 23 is forced into the lubricating grooves 35 and 36..v

For the purpose of preventing chattering or other vibrations duringstarting or stopping the machine, a ring 31 having a hardness differentfrom that of system I, is provided, and is pressed, by means of springs38, ,to a predetermined degree againt the pedestal or base 39, so thatit is displaced, relatively to the pedestal 39 by the frictional forces,corresponding in degree to the degree of forcing.

Due to the flyweights 25 and 26 rolling upon the inner cylindricalsurface of housing-part I8,

The system II, therefore,"

24 can never come inwardly and occupy a central position in thework-chamber 24.

For ease and accuracy in machining the housing part l8, its innercylindrical face is broached all around at once so that the twofiyweights 25 and 26 can-be accurately machined to the same diameter andso that their rolling motion takes place evenly both on the lower and onthe upper side. In that case the disc 20 must be machined to the samediameter and is securely held in the casing part I8 by means of theradially-extending, conical studs 43.

The elastic suspension of I, 2, etc. from ring 9 is effectuated in sucha way that the point of nintersection of the resultant forces actingupon the various systems is situated, relatively to each individualsystem, at least in the vicinity of the center 42 of the elasticmain-suspension so that no knocks can come on the suspending means. Thering 31, also, is arranged in such a. way that the thrusts delivered byit to the machine result in a central thrust point or impact-point whichis situated in the vicinity of point 42 so that no knocks, thrusts, orother sudden forces can be delivered .to the support l2 either onstarting or stopping the compressor.

The embodiment of the invention above described merely serves toillustrate the principles of the invention, and various changes in theform, construction and arrangement of parts thereof may be made withoutdeparting from the invention, the scope ofwhich is indicated in theappended claims.

I claim 1. In a machine for working optionally as pump and compressor,in both cases independently of stufiing boxes, the combination of adriving structure including an electro-motor rotor circumscribing thewhole machine by being a body with a centric surface of revolutionrotative about its axis of symmetry; an intermediate structure arrangedwith its axis of symmetry displaced relatively to the axis of rotationof the rotor comprising at least the non-rotating part of theelectro-mot'or and a pump casing containing the working chamber movingtranslatorily under the influenceof the driving structure; and astructure for working on the fluid, said last being driven by theinertia effects caused bythe said translatory motions of theintermediate structure, said driving structure and said intermediatestructure being. mutually so mounted as to place the axes of theirmotions substantially parallel. a

2. A compressor in accordance with claim 1, in which all threestructures are so arranged relatively as to place their axes of movementparallel to, each other.

3. A compressor in accordance with claim 1,- in which the translatorilymoving structure and the structure for working on the fluid are arrangedwithin the driving structure in such a manner that the resultant-weightis taken directly by the driving structure.

4. A compressor in accordance with claim 1, in which there is a fixedsupport for the driving structure, a gudgeon pin secured to said fixedsupport, the driving structure being lournaled on said pin.

5. A compressor in accordance with claim 1, in which there is a fixedsupport for the driving structure, a bearing secured to said fixedsupport, and. a journal for the driving structure on said fixed support.

6. A compressor in accordance with claim 1,

in which the compressor has a main suspension point and the centralimpact points of the forces -which' arise as the resuitants of theforces exerted upon any one of the structures by the other structures issituated for each individual structure in the vicinity of the main pointof suspension of the compressor.

8. A compressor in accordance with claim 1, in which the drivingstructure is provided with a rotating housing bell-shaped and open atthe bottom whereby to admit conduits for conveying the working mediumand the lubricant.

EMIL KAGI.

